Assuming that (scan) is a properly initialized scanner variable, which of the following correctly inputs a double?

Homework Help: Questions and Answers: Assuming that (scan) is a properly initialized scanner variable, which of the following correctly inputs a double?

A. double val = scan.nextLine();
B. double val = scan.nextDouble();
C. double val = nextDouble();
D. double val = scan.nextValue();
E. double val = scan.nextpouble;

Answer:

First, let’s understand the questions: It’s about to determine the correct way to input a double value using a Scanner object.

Given Options: Step by Step Answering

a) double val = scan.nextLine();

• nextLine() reads an entire line of input as a String, not as a double.
• This is incorrect because it will not convert the input to a double.

b) double val = scan.nextDouble();

• nextDouble() is the correct method in the Scanner class to read the next input as a double directly.
• This is correct because this method reads and converts the input into a double.

c) double val = nextDouble();

• This calls nextDouble() without specifying the scan object (which is the Scanner instance).
• This is incorrect because it doesn’t reference the scanner object.

d) double val = scan.nextValue();

• There is no method called nextValue() in the Scanner class.
• This is incorrect because this method doesn’t exist.

e) double val = scan.nextpouble;

• This has a typo. There is no method nextpouble().
• This is incorrect due to the syntax error.

Final Answer

Based on the above analysis, the correct answer is:

b) double val = scan.nextDouble();

This method call will read the next token from the input as a double value.

Learn More: Homework Help

Q. What capability do smartphones have that telephones with earlier technology lacked?

Q. Which technology is most useful to help self-driving vehicles?

Q. The score of a student in two subjects are inserted in the B2 and C2 cells and the passing score for each subject is 60. Which of these functions will you insert in the D2 cell so that it returns TRUE if at least one score is greater than or equal to 60, or else it returns FALSE?

Q. Which address is used by a Layer 2 switch to build its MAC address table?

Q. The score of a student in cell B2 is 65 and in cell C2 is 75. Which of the following functions will you insert in cell D2 so that it returns FALSE if any of the conditions are false for the values in cells B2 and C2?